Question

JAVA编程出错。

为什么我添加了awt.event包了，然后编程时用ActionListener还回出现The method addActionListener(ActionListener) in the type AbstractButton is not applicable for the arguments (EventTest.ButtonAction)这个问题？？？

class EventTest extends LayoutManagerTest
{
ButtonAction actionObj;
public EventTest()
{
actionObj =new ButtonAction();
comboBox.addActionListener(actionObj);
buttonObj.addActionListener(actionObj);
}
class ButtonAction implements ActionListener
{
int i=0;
String[][]data={
{"张谨 ","12345678901","女","35 "},
{" "," "," "," "},
{" "," "," "," "},
{" "," "," "," "},
};
头文件
import javax.swing.*;
import java.awt.*;
import java.awt.Event.*;

下面的接上面程序后面
DialogEvent dEObj;
JButton soures;
public void actionPerformed(ActionEvent ev)
{
Object obj=ev.getSource();
if(obj==comboBox)
{
data[i][2]=(String)comboBox.getSelectedItem();
getAppletContext().showStatus("你选择的客户性别为："+data[i][2]);
return;
}

Answer 1

class ButtonAction implements ActionListener

这句话中，你的ButtonAction类继承了ActionListener接口那么必须实现它声明的方法
public void actionPerformed(ActionEvent e)

追问

这句话在后面有哦

追答

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
这里需要导入这两个包，你都导入了吗

Answer 2

参数传的时候写错了，应该是new EventTest.ButtonAction()才对。

Answer 3

ButtonAction是怎样定义的？

错误提示是ActionListener不能监听ButtonAction类的动作。

Answer 4

正常

actionObj =new ButtonAction();
JComboBox comboBox=new JComboBox();
comboBox.addActionListener(actionObj);
JButton buttonObj=new JButton("dddd");
buttonObj.addActionListener(actionObj);

不知道你的comboBox是哪个类的。

Answer 5

ActionListener接口实现了？